(iii) Lessee has full details of its source and maintenance
 records with back to birth traceability on all Life
 Limited Parts.

 Such replacement Engine shall be deemed an "Engine" as defined
 herein for all purposes hereunder. Lessee agrees to promptly
 notify Lessor of any such substitution, and provide Lessor
 with an officer's certificate confirming full compliance with
 this Clause 11.1(e). Lessee agrees to take such action and
 execute such documents, including a warranty bill of sale, as
 Lessor may reasonably request in order that any such
 replacement Engine shall be duly and properly titled in the
 name of Owner and leased by Lessor hereunder to the same
 extent as the Engine thereby. Lessor shall take such action
 and shall execute such documents, and shall cause Owner to
 take such action and execute such documents, as are reasonably
 necessary to convey title to the Engine replaced pursuant to
 the preceding sentence to Lessee. Such conveyance shall be
 free of and warranted as against Lessor Liens, but otherwise
 without representation or warranty, express or implied.

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 (b) Subject to Clause 8.16 hereof, Lessee shall promptly procure
 the replacement of any Part which has become time-, cycle- or
 calendar-expired, lost, stolen, seized, confiscated,
 destroyed, damaged beyond repair, unserviceable or permanently
 rendered unfit for use, with a part complying with the
 following conditions:

 (i) it is of the same manufacturer and model (or, at
 Lessee's option, an improved model), it is in as good
 operating condition as the replaced Part, it has
 equivalent interchangeable modification status and
 equivalent or more hours available until the next
 scheduled check, inspection, overhaul and shop visit as
 the replaced Part and it is of an equivalent or greater
 value and utility as the replaced Part;